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Fix EXCP_MASK to include all relevant bits from scause.
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Authored by jhb on Feb 5 2020, 12:15 AM.
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Details

Summary

While cause codes higher than 16 are reserved, the exception code field
of the register is defined to be all bits but the upper most bit.

Test Plan
  • CHERI RISC-V uses exception code 0x1c which was truncated to 0xc with the current mask

Diff Detail

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Unit
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Build Status
Buildable 29174
Build 27106: arc lint + arc unit